Vacuum ice-machine.



No. 828.888. ISATENTED 111111.21, 1906. W11. HOOINAGLE.

VACUUM ICE MACHINE.

APPLICATION FILED MAY zo'y 190s. RENEWED MAY 1'2, 1906.

s SHEETS-SHEET 1. I

l A Y f M i \\\\\\\\\\\\i\\\\\\\\\\\\\\\ PATENTBD W. T. HOOPNAGLE.

VACUUM ICE MACHINE.

APPLICATION FILED MAY 20, 1903. RSNEWED MAY 12, 1906.

AUG. 21, 190e.

3 SHEETS-SHEET 3.

wiLLiAi/i ir. noorNAeLE, or wHrnsroNa, New vonk.

VACUUM BCE-MACHINE.

n, eaases.

Specixicatioi: of Letters Patent.

Patented Aug. 2'1, 1906.

Application filed May 20, 1903. Renewed May l2, 41906. Serial No,316.421.

To all whom, it may concer-71,:

- Be it known that l, W'ILLIAM T. HOOF- NAGLE, a citizen of the UnitedStates, residing at Whitestone, in the county of Queens and State of NewYork, have invented certain new and useful Im rovements in VacuumIce-Machines, of wliich the following is a speciiication.

The purpose of my invention is to provide means for manufacturin clearice by the vacuum process, in whic the water to be frozen 'is congealedby its own partial vaporization in a high vacuum.

ln carrying out my invention the water to be frozen after having iirstbeen properly iiiltered or otherwise clarified is introduced into aclosed deaeratingl'and cooling chamber which is connected to suitableexhaust mech anism adapted to maintain a vacuum in the chambersufliciently high to e remove the greater part of the air from the water,and cool the water by its ownlvaporization to a temperature near .theIfreezing-point. The vacuum maintained in this chamber, however, isinsul'licient to cause the Water to congeal. Suitable means are providedfor spraying, spreading, in thiscooling and deaerating'chamber, so thatthe entrained air and gases will readily leave the waterA and ass offwith the vapors to the exhaust mec anism. After having I beenpreliminar-ily deaerated as far as practicable and relieved of part ofits heat in this the water without again being broughtl in contact withthe atmosphere and while stillv under-less than atmospheric pressure isconveyed in regulated quantities into a freezing-chamber and deliveredinto one or i partof its air formed. j

more constantly-moving pans. This freezing-chamber is connected withsuitable ex:v

haust mechanism, and a high enough vacuum is maintained inthe chamber tocause water. y,

rapid evaporationandfreezilng of the The pensare moved in such manner`as to flow the water back and forth therein, vthus exposing the water inthin sheets to the influence ofthe high vacuum,'so that any airremaining therein is readily freed and removed and the water is quicklyfrozen in thin successive layers. buil-t up'in' the pans. kAsthe wateris preliminarily cooled and relieved of the greater chamber and thenexposed in thin sheets'in said chamber, the blocks of ice` are quicklyand agitating the water while i Cakes of clear ice are thus beforeentering 4the freezing- The mechanism for carrying out my invention isillustrated in the accompanying drawings, in which- Figure 1 is a sideview, partly in section, of an apparatus embodying my invention. Fig. 2is a plan view of the same. Fig. 3 is a side view of thefreezing-chamber, showing the connections for operating the valves toadmit water to the ans or trays in which the ice is formed and) also theconnections for rocking the trays. Fig. 4 is a detailed pers ectiveview, on an enlarged scale, of one of t e water receivers or collectorsfrom which the water is admitted intermittently to the trays, one end ofthe collector being partly broken away. Fig. 5 is a front lview lookingfrom thev right in Fig. 1 of they cam-levers, cams, and connections foroperating the valves; and Figs. 6 and 7 are side views showing filtersarranged between the deaerating and freezing chambers.

Referring to the drawings, A indicates suitable exhaust mechanism, whichin the drawings consists of a pump having low, intermediate, andhighpressure cylinders 1, 2, and 3, respectively,l through which thevapors from a .freezing-chamber B are successively and continuouslydrawn and ejected into the atmosphere or a suitable condenser during theice-making process, the va ors passingfrom the freezing-chamber`to t ellow-pressure cylinder 1 through afpipeconnection 4.

The freezing-chamber `By is made ,air-tight and provided at one end witha door 5, through which access may be had to the interior of thechamber.: A highvacuurn is constantly maintained in the freezing-chamberB, and the water, admitted tosaid cham ber' in 'the manner hereinafterdescribed, is ,frozen by its own partialfrrapid evaporation,

the vapors therefrom being carried 0H by the ump. ,In yorderto'removlfefthe ice from the eezmg-chamber, a valve 6 ispro'vided in thepipe 4, by which communication between the pump andfreezi'ng-chamber mabe cut off,

landan air-inlet valve 7 is provi ed at asuit- `able placeifor admittingair to the chamber inorder to'break.the lvacuum ,and permit the door 5to be opened. I The waterto be frozen first supply-pipe 8 'through asutab e thence -ing chamber D. l.This chamber, as shownfis asses trom` avertically arranged and provided with a se; ries of reversely-inclinedbaffle or' spre'adjiflgll plates l0, upon the'uppermost one'of which,

y filterv C and y a pipe 9 to a deaeratingand cool-v IOO IIO

the water is delivered from the pipe 9 through a rose or spraying device11, which sprays the Waiter uponl the plate. The water flows downwardlyover the plates in a Athin stream or layer and accuinulatesin the lowerpart of the chamber, wherein is arranged an agitating device E,consisting of a horizontally-arranged and suitably-driven shaft 12,having thereon a. series of radially-arranged blades or beaters 13,which a'gitate the body of water in the bottom ofthe chamber. The upperportion of the deaerating and-cooling chamber D is connected. to theintermediate cylinder of the pump by a suitable pipe 14, and a partial'vacuuni is thereby'inaintained in said chamber. As the chamber isconnected to the intermediate cylinder of the pump, the vacuum is notsufficiently high to cause the water in the chamber D to congeal but thevacuum is high enough to cause rapid evaporation of part of'thewater andcooling of the remainder to a temperature close-to the freezing-point.This partial vacuum relievingthe water of its atmospheric pressurepermits the air contained in the water to escfnetherefrorn and to passout of the chamber with the vapors, andA the spraying, spreading'andagitation of the water within the chamber permits the entiainedair tofreely from the water, thus leaving the atter in a practically deaeratedcondition when it leaves. the chamber. In \order 'to' take care of thcvapors from the chamber D, the 'intermediate cylinder- 2 of the pump,which isconnected to said chamber, is made somewhat larger 'in diameterandcapacity than it otherwise woul be,

The water after having been deaerated and cooled downto a temperaturenear the freek, ing-pointris admitted to the freezingchamber1 B'witlnnit being-permitted to. again. come into contact with theatmosphere or tobesub.- jected to atmospheric pressure.- Asshown,-

1 thedeaerated and cooled water'frolrn-thc;

chamber D passes through a pipe 15 into brancliA pipes 1,(5 and..17, inwhichaife,ar-jl ranged antomatically-operated valve-s 1'8 and 19,respectively. These branch pipeslagd 17' lead' througlrthe walls ofthevaeuunioip freezing chamher B into receivers, or;v collec-f Irespectivr-zly,l secured trans,- versely in the freezing-chamber., Asshown in Fig, 4, each receiver consists of a vtrough made air-tightandhaving downwardly-convergin sides 20, the lower edges ofwhich arehevelel to forrnknife-edges, as indicated by' the'nuineral 20w. Thetrough isclosed-.at itsA lower side by a valve 21, whichissecuredby arms22 to a shaft. 23, which is journaled in suitable lugs or bearings. 24upon the side of thetrough. A facing 21, of rubberor other suitablematerial, is arranged upon the upperv side'of the valve, .so that whenthe valve is closed'a gas andtwater tight joint is forn'led between. thevalve -and the knife-edges of thel .emptied into the pans,

seas es "s, two= rocking centrally upon which are suitably supported. ina horizontal position within the freezing-chamber. The shaft 28 eX-tends through. a suitable stufling-box in the wall of.l the,freezing-chamben andf is provided atv its outer end .with a crank-arm,29. The trays are connected by a link 30, so that when the crank-arm isrocked the trays .willgrock in. unison. These trays 'carryv 'the'removable pans .31 and 32 witliinwhich. theyhlocks of ice are formedThe water receivers lorcol.- lectors and the trays are so@ arranged.that when the latter are tilted,` asshown inI Fig. l, the receiverswill.beatthe upper ends of the pans, and the traysareiarranged;sethat.theymay rockv about thirty degrees from the horizontal in.v bot-hdirections. without interfering with the receivers.-

The trays are constantly rocked backand forth toperinit thewaterdelivered into the pans to freezein successive films orl layers. Thevalves of. thewater-.receptacles are no1:- nially held closedby springs33connected to the ait-ms .25 and;2,6 and areopened periodically topermit the water contained .inl the receptacles to.flow,into.. the pansafter-.the lat,- ter have Inadeta, stated number of oscilla.- tions,during whichtime the water, delivered into the pans .flows vback and.forth-and,- is frozen in successive layers., byreason. ofthe. rapidevaporation. oft a, portion off thev water. Each receptaclefalterfhavingits .contents dis- IOC lof;

charged remains .empty untill shortly before its valve. 1s againlopened. .whenfit is'reflledv with` water. from .the de aerating andcooling. chamber. The :water thereforawhich is at a low temperaturaafter. leaving; thewdeaerating-chamber. does, not.. yenter the.freezingchamber until' about. tha-time ibis. to` be ice` in. thewater-receptacleadoes not take place.

As shown in the drawings, the trayscarryi ngtheforniing-pans ,are rockedmeans. of a rod 34., connected: to thecranlg-.arm 29 and, to a crank-pin.35,- carriedx by .a constantly-- rotated.driving-shaft. The valve 21 ofthe water-receptacle. F is opened afterthe admeans of. atrod 37,connected, to thecranlrf arm 26- andtothe. end ofa cam-lever 38,'whichlatter has. a, cafri-surfecee.A arranged inV thc-'path of apin 39upon` aGaIn-wheel 40. This. cam-wheel is securedv to a shaft 41,which'is driven .by

ing-shaft S6 and a gear 43 upon the caniand theformation of v )acont pan32 has, made. six oscillationsby a pinion 42'upon the drvi EQQRS shaft,the ratio of gearing shown in the drawings being one to sin. .Thecam-wheel rotates in the direction indicated by the arrow, and thelsurfaceof the cam c is so formed that the pin 39 will raise the lever38 promptly to open thevalve and allow the water to ,pour

into the 'pan in a solid stream the Width of the pan without splashingwhen the pan isv tilted into the position shown and'permit the valve anyformed upon the valve-face or the narrow edgesv el the val ve-seat willbe cut ofi l by the impact of the valve' against the seat.

ln the same manner the valve of the receptacle F is opened once forevery six oscillations of the pan 31 by a pin 44,'arranged upon theopposite side of the cam-wheel 40 and diametrically opposite to the pin39, a cam-le ver and a rod4 46 connectin said cam-lever with thecrank-arm 25. T ie receptacles for 'the diil'erent pans are o cnedalternately vber.

instead of lsimultaneously orthe purpose. of equfalizing the evaporationWork required of the pu rnpuand maintaining a more uniform vacuum.

The receptacles, as stated, are not reiille'dv immediately afterdischarging their contents, the supply of water from thedeaeratingchamber being normally cut off by the valves v18 and 19,arranged in the branch pipes 16 and 17. These cut-olf valves 18 and 19are opened immediately before the valves of the water-receptacles areopened by meansiof' rods 49 and 50, connected to the valve-levers 47a'nd 48 and to cam-levers 51 'and 52, re-

spectively, which cani-levers are adapted to.

'will be understood vthat a single pan or any number of pans may beemployed. Prefer-.

ably, however, two, or more pans are used and the water is dischargedinto them suc# cessively at intervals in order to keep the supply ofwater in the freeziIig-chamber as unil'orni possible, so that the vacuumand-the Work required of the pump may beuniform.l

As the water is admitted from the deaerating and cooling chamber intothe freezing-charnber without being in the meantime brought into'contact with the atmosphere or subjected to atmospheric. pressure and iscooled .almost to the freezing-point vbefore entering' thel'reeziiiglclialnbcr, the total Work re- .to be closed suddenly by` thespring, so that as lthe interiors of the pans.

'quired of the pump is not in au;v way in vcreased by the deaerating andcooling ,e

ess. The clear; ice may therefore be made with substantially the sam-eexpenditure of power as is required in making the vacuum ice, which isIlcharacteriZed by its whiteness, duev largely to the entrained air. iThe 'water-reeeptacles are nearly as wide They are filled with water.intermittently,. as stated, and when the 'valve of a receptacle isopened lthe water falls in a sheet Marly or quite as wide as theinterior of the pan and in such volume that it. does not freeze infalling. As thevpan is tilted so that its upper end is adjacent to thereceptacle at the moment when the Water is delivered into the pan,splashingis avoided, and thewater flows tothe opposite end ofthe pan inathin sheet and is then rocked back and-forth and is frozen in layer-sconforming to the dimensions ofthe an, thus building up 'a solid blockof clear ie tof the same shape as the pan? s the water spreads out in athin llheet of comparatively large area in the pan' whilfrbeing gentlyrocked back and forth,` any airremaning in. the Water passes off Withthe va ors.

' Ice "owned-by the vacuum process in. the usual way by'spraying thewater into a vacuum-chamber is opaque, Kowing to the en'- trained airand to some extent to the irregui' lar arrangement or formation of the ice crystals", andthe same difliculty has arisen in attempts to form icein a vacuum from still wa- 'ter'in cans. By my process the water isfrozen in a state which is es cer'vrrmt with the spraying processcomparatively quiet and dense,A and as. the Water 1s prelilninaiilyc''oled to a low temperature and deae'rated and then admitted to thepans intermittently in such quantities thatit will pass into the pans insolid sheets Withoutfreezing and is then rapidly frozen in layers notrouble i s experienced from irregularity in ice crystals or entrainedair.

,1 find it advantageous to arrange the filter between thedeaerating-ehamber and the freezing-chamber as shown in Figs. 6 and' 7.In Fig. 6 the water from thesource ofsupply. is

vadmitted directly to the rleaerating-ehamber Dthrough the su )ply-pipe8. 'After deaeration in this chamber the Water flows bygravity throughthe pipe 15, filter C, and pipe 15b to the branch pipes 16 and 17, whichlead to the water-receptacles in the freezingcharnber. The fdeaerationof the water causes a preeipitate'in the deaerating-ehamber, which isremoved by the filter C. ln Fig. 7 the arrangementA is'the same, lexceptthat a large filter Uris arranged to filter. the water before enteringthe leaerating-chamber through the pipe 9, and a smalleriiilter C isarranged,between the pipes l5u and 15b te remove the precipitate whichresults from the ,lmteration of the water. -With the IOO IIO

f Water intermittently vfrom said deaerating- Were not deaerated .or ifitWere forced into chamber, means for moving said pan, a Wavarranged todeliver water into said pan,

arrangement shown in Figs. and 7 itis unl necessary to use a eoagulant,such as alum, to clarify the water. IVliere'it is inconvenient to raisethe d'eaeratinff-chambe'r high enough above the filter to obtain theneees sary head to force the Water .through the filter, a pump may ofcourse beinsjerted in the' pipe 15a to supply suflicient force to passthe Water through the iilter. Owing to .thefact that the air is removedand the Water is car ried from one vacuum-chamber into another chamberhaving a slightly higher vacuum Without coming in .contact with theatmosphere or being subject to atmosphericpr'es sure in the meantime,there is no' spraying of the water on entering the-reezing-chamber, suchas would takeplace if the Water the chamber by atmospheric pressure.

Having described my invention,V what I claim, and desire to secure byLetters Patent of the United States, isl l. In a vacuumice-machine,` adeaerating and cooling -chaniberadapted .to contain the liquid to'befrozen, means for maintaining therein a partial vacuum insuicient tofreeze the li uid, a freezing-chamber, a mojvable pan Wiilli'inthefreezing-chamben mechanism arranged to move the panconstantly, mechanismigor automatically admitting liq-` uid'at regular intervals,.inregulated quantities from said cooling and deaera'ting chamber intosai/d pan, and means' for maintaining a suficientlyhigh vacuumin the'-freezing chamber to l'reeze the liquid in the pan. A

2. In a vacuum ice-machine, a deaerating and coolingl chamber, afreezing-chamber, exhaust mechanism connected to both of said chambers,a pan Within the freezingter-rec`eptacle Within the freezing-chambermeans for admitting regulated quantities of chamber into said receptacleand means for emptying each-charge of water from said receptacle intothe pan immediately after the water has been delivered into thereceptacle. 3. In a vacuum iceen'iachine, a deaerating and coolingchamber, a freezing-chamber, exhaust mechanism'connected to both of saidchambers, a pan within the freezingchamber, means for moving said pan, ayivater-receptacle within the freezing-chamber arranged to deliver Waterinto said pan, means for opening and closing said reeepta cleperiodically and means for periodically admitting water from said.leaeratingchamber into said receptacle. 4. In al vacuum ice-machine, adeaerating and cooling chamber, a freezing-chamber, exhaust mechanismconnected to both of said chambers, a pan within the vfreezing-chamber,means for rockin'g said pan vertically, a

water-receptacle within the freezing-chamber arranged to deliver Waterinto one end ol' said pan, means for opening and closing saidAreceptacle periodically, and means for admitting. Water fromA saiddeaerating-chamber into said receptacle.

5 In a vacuum ice-machine, a deaerating and cooling chamber, afreezing-chamber' exhaust mechanism connected to both of said chambers,a pan Withinthe freezingehamber, means for rocking said pan vertically,a

Water-receptacle Within the freezing-chamber arranged to deliver Waterinto one end of said pan, means for opening and closing said receptacleperiodically, andh means for periodically admitting 'Water from saiddeaerating-chamber into sa'idreceptacle..y

6. In a vacuum' ice-niachine,a deaerating and cooling chamber, afreezing-chamber, exhaust mechanism connected to both of said chambers,a pan Within tlieireezingcham ber, means for rocking said pan, a{Water-receptacle within the freezingehamber having an elongated porteropening above the pan', a valve for said port, mechanism for opening andclosing said valve periodically, and

means' lfor admittingvvater from said deaerating-chamber into said recetacle.

7`. In a vacuum ice-mac ine, 'a deaerating v and cooling chamber, a'lireezing-chambfenexhaust mechanism connected to 'both ots'aidchambers, a pan Within the freezing-chamber, means for rocking lsaidpan, -a water-rel ceptacle within the ireezingchamber having anelongated port or opening abovethe pan, a valve for said port, mechanismfor opening and closing lsaid valve periodically, and. means forperiodically admitting water from said derrerating-chamber intosaid'irecepta- Cle.

S. In a vacuum ice-machine, a deaerating and coolin(r chamber, afreezing-chamber, ex-

haust mec anism connected to both of said chambers, a pan Within thefreef/ing-cliai`nl ber, means for rocking said pan vertically, aWater-receptacle `Within the freezingfchamber having a port above thepan arranged.

transversely of the plane of movement of the pan, a valve for said-port,mechanism for openingandclosing said valve periodically, and means foradmitting water from said deaerating-chamber into said receptacle.

9, In a vacuum ice-machine, a deaerating and cooli'nor chamber, afreezing-chainber, .exhaust mechanism connected to both of said.chambers, a pan within the 'freezing-claimber, means for rocking saidpan vertically, a Watenreceptacle within the vl'reezingwlnnnbei' havinga port above the pan arranged .transversely oi the plane of movement ollthe pan, a valve for said port, mechanism lor lopening and closing saidvalve periodically, and means for periodi ailly admitting water fromsaid deaerating-chamber into said revceptacle.'

l0. In a vacuum localiza-bine, a deaei'aling IOO TIO

the dea'erating-chamber.xto 'said receptacle,

' receptacle Within the 'chamber having a port,

- ally. Y

y a va ve-seat having a'thin or sharp edge, surchamber, means formaintaining a high vacu- Water into said chamber, said ptissage-way ber,means for delivering Water from said de- .aeratmg-chamber 'into saidreceptacle, and

haustfmechanism connected to both of said,

'numberof oscillations,` and means for emptymg the Waterromsaidreceptacle into the` 35" .and means for opening and closing saiand cooling chamber, a freezing-chamber, eX- liaust mechanism connectedto bath of' said cha1nbers,'a pan 'Within the 4'freezing-chamber, aWater-receptacle Within the freezingchamber arranged to deliver' 'Waterinto said pan, a conduit or passage-Way leading fromV means for rockingsaid pan vertically, and` means for delivering Waterfrom said receptacleinto the pan periodically after thelatter'has made a stated number'otoscillations. 11. In a'vacuum ice-machine, a deaerating 'andcoolinvchamber, a'freezing-chamber,exhaust mec anism-connected to bothof saidchambers, a pan Within the freezing-chamber, meansfor constantlgyTrocking said pan, a water-receptacle Within the freezing-chammeanslforemptying the Wateiirom said receptacle into the pan'periodicallyafter the latter has 'made a stated numberof oscillations, l 12 In avacuum ice-machine; a deaerating and coolin'of chamber, afreezing-chamber, eirchambers,`a`pan within the freezing-Chani-l ber,means for constantly rocking said pan, a Water-receptaclewithin. thevreeZ'ingSChambei", means for 'delivering Waterfrom said deaerating-chamber intosaid receptacle,peri odically, after said pan hasmade, a stated pan immediately after the. receptacle is iilled;

13., In a vacuum. ice-machine, a freezingchamber, means for maintainingahigh vacuum'therein, a pan in said cham-ber, means for moving theV(ipan, and means-for admitting Water to sai panperiodicallycomprising aa valve-seat surrounding,said port, a valve adapted .teilt against saidseat and having a sharp line ofcontac't therewith, means for admittingwater to. the rec'ep tacle,`and means fori opcring and closing saidvalve periodicl4. In a vacuum ice-machine, a freezingchamber, means formaintaining a high vacuum therein, a pan in said chamber, means formoving Vthe pan, and' means for admitting Water to said panperiodically.comprising a rece tacle within the chamberhaving a'port,

rounding said port, a valve having a'packing thereon adapted to iitagainst said edge, means for admitting water to the rece tatie,

d) valve periodically.

, 15. In a vacuum ice-machine, a freezingum therein, a passage-Way forconducting having a; port within the chamber and a l "within the chamberadan'ted tc lit. again the seat and having a Sharp line of contact thereAWith, and means for opening andclosing said valve. Y

.16, In a Vacuum ice-machine, a freezingum therein, a passage-Way forconducting `having a port Within the chamber and a valve-seatsurrounding said port, a valve within the chamber .adapted to iitagainst said seat and having a sharp line ci contact therewith., andmeans for periodically opening said valve and for giving said valve asuden movement in closingl 17. In a vacuum ice-machine, an exhaust--pump having high, intermediate andllovf compression cylinders or'compartments, a deaeijatin and cooling chamber connected by a conduitdirectly to said intermediate compartmentrand a freezing-chamberconcoolin(r chamber into said freezing-chainlrer. .20. v gna vacuumice-machine, a free/Lingchamber, means for maintaining a highvacuum'therein, a plurality ot pans in said chain ber, means for rockingsaid pans, valve-ren trolled mechanism arranged to admit anti-a'v inregulated quantities to each of said pans, and means for operating'saidmechanism so as to admit water-to said pans successively. 21. In avacuum ice-machine, a freezingj chamber, means ior maintaining a highvacuum therein, afplurality of pans 1n said chamber, means lor rocking'said pans, awater-receptacle within the chamber adjacent to reach pan,means for admitting water tov said receptacles successively, and meansfor dis- -charging the Water from said receptacles into the adjacentvpans successively.

` 22. In a vafcuum ice-machine, a freezingchamber, means for maintaininga high -vacnum therein, a pan in said chamber, mechanism arranfed torock the pan Iconstantly,

valve-seat surrounding said port, a valve chamber, means iormaintainingahighv vacnnected by a separate conduit to said loW-comsion compartment,vand meansior admitting e; and cooling 'chain-- Water periodically' fromsaid deaerating and-- valve-controlled mechanism foi'istriuted and.

water into said chamber, said passage-way Virc ranged to deliverregulated quantities of l ater into said pan in streams of such volmitWater to the pan.

23. In a vacuum ice-machine, a deaeratingchamber, a freezing-chamber,exhanst mechanism connected to both of said chambers, a

Io pan Within the freezing-chamber, mechanism arranged to rock the panconstantly, valvecontrolled mechanism constructed and arranged todeliver water from said deaerating- 25. In a vacuum ice-machine, afreezingchamher, means for maintaining a high vacuum therein, a pan insaid chamher7 means for automatically rocking said pan, awater-receptacle arranged to deliver Water intl) said.

= pan, means for charging said receptacle With 'chamber into said pan ina stream snbstan- '1 i; tially as Wide the pan and of such volume thatthe water will not freeze While pouring into the pan, and means lorintermittently operating said mechanism to admit water te the pan. v

24. In a vacuum ice-machine, a freezingchamher) means for maintaining ahigh. vacunm therein, a pan within the freezing-chamhcr, ineans formoving` said pan, a Water-receptacle within said chamber arranged todeliver water into said pan, said receptacle having a port substantiallyas wide as the interior ofv the pan, a valve lor closing said port,means for filling said receptacle with Water, and n Vans for openingsaid valve to allow 3o the water to Ilow in a solid stream into saidpan.

Water, and means for discharging the contents of the receptacleintermittently.

26. In a vacuum ice-machine7 an exhaustpump having several cylinders orcompartments, a freezing-chamber connected by' a conduit to thelow-compression compartment, and a deaerating-chamher connected n y aseparate conduit directly to a higher-- compression compartment.

27. In a vacuum ice-machine'7 an exhaustpninp having several cylindersor compartments, a freezing-chamber connected by a conduit to thelow-compression compartment, a deaerating-'chamber connected by aseparate conduit directly to a higher-compression compartment, and meansigor admitting waterfrom the deaeratingchamher to the freezing-chamber.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM T. HOOFNAGLE.

Witnesses:

J. H. GAssLER,` G. W. HOPKINS.

